[mlir][StorageUniquer] Restore old signature for default implementation of verifyInvariants.

PR llvm#102326 changed the prototype of the default implementation of
verify to include emitErrorFn.

This breaks automatic derivation in consumer attributes, such as
https://github.com/tensorflow/runtime/blob/60277ba976739502e45ad26585e071568fa44af1/include/tfrt/core_runtime/opdefs/attributes.h#L53.

This PR simply restores the signature to what it was prior to PR llvm#102326.

Author: bchetioui

mlir/include/mlir/IR/StorageUniquerSupport.h

@@ -227,8 +227,7 @@ class StorageUserBase : public BaseT, public Traits<ConcreteT>... {
   /// Default implementation that just returns success.
   template <typename... Args>
   static LogicalResult
-  verifyInvariants(function_ref<InFlightDiagnostic()> emitErrorFn,
-                   Args... args) {
+  verifyInvariants(Args... args) {
     return success();
   }